Abstract: In the starting process of a certain front-engine front-drive vehicle, the "click" sound appears and the high occurrence rate of this trouble seriously affects the quality of whole vehicle. Through the investigation and analysis, it is clarified that the phenomenon of abnormal noise is caused by the stick-slip vibration of the contact end face between the wheel-hub bearing and the driving half-shaft. In the stick-slip process, the friction type of the contact end face transfers from static friction to dynamic friction and the axial impact introduced by the changes of friction coefficient generates abnormal noise. A simplified physical model is established, the influences of dynamic and static friction coefficients, positive pressure and contact area on stick-slip motion are analyzed. A special anti-friction washer is added to the contact interface to minimize the change of friction force during the transfer from static friction to dynamic friction, so that the trouble of starting "click" noise is eventually solved. At present, there are few researches on stick-slip friction in vehicle transmission system. The research in this paper has reference significance for the similar stick-slip abnormal noise treatment in the design process of the new vehicle transmission.